Sulfide-type compound particles, solid electrolyte, and lithium secondary battery
Sulfide-type compound particles microparticulated, having an argyrodite-type crystal structure, and including lithium (Li), phosphorus (P), sulfur (S), and a halogen (Ha). As sulfide-type compound particles that can inhibit generation of hydrogen sulfide gas even upon contact with moisture in the atmosphere, provided are sulfide-type compound particles having D50 in a volume-basis particle size distribution of 50 μm or less and having an occupancy of sulfur (S) and the halogen (Ha) in the S3 (4a) site, as calculated by a neutron diffraction measurement, of 85% or more.
1. Sulfide-type compound particles having an argyrodite-type crystal structure, comprising lithium (Li), phosphorus (P), sulfur (S) and a halogen (Ha), wherein
D50 in a volume-basis particle size distribution obtained by measurement using a laser diffraction scattering type particle size distribution measurement method is 50 μm or less, and
the occupancy of sulfur (S) and the halogen (Ha) in the S3 (4a) site, as calculated by a neutron diffraction measurement, is 85% or more.
2. The sulfide-type compound particles according to claim 1 , comprising, as the halogen (Ha), one or two or more of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I).
3. A solid electrolyte comprising the sulfide-type compound particles according to claim 1 .
4. The solid electrolyte according to claim 3 , wherein D50 in the volume-basis particle size distribution obtained by measurement using a laser diffraction scattering type particle size distribution measurement method is 50 μm or less.
5. An electrode material for a lithium secondary battery, comprising the solid electrolyte according to claim 3 , and a positive electrode active material and/or a negative electrode active material.
6. A lithium secondary battery comprising a layer comprising the solid electrolyte according to claim 3 .
7. A solid electrolyte comprising the sulfide-type compound particles according to claim 2 .
8. The solid electrolyte according to claim 7 , wherein D50 in the volume-basis particle size distribution obtained by measurement using a laser diffraction scattering type particle size distribution measurement method is 50 μm or less.
9. An electrode material for a lithium secondary battery, comprising the solid electrolyte according to claim 7 , and a positive electrode active material and/or a negative electrode active material.
10. A lithium secondary battery comprising a layer comprising the solid electrolyte according to claim 7 .